Chain grate.



A. GIRTANNER.

CHAIN GRATE.

APPLICATION FILED mums. 1a14.'

Patentd Oct. 24,1916.

INVENTOR Afiirtanner,

WITNESSES: (ax QM OFFICE.

ALEXANDER GIRTANNER, OF ST. LOUIS, MISSOURI.

Specification of Letters Patent. Patented Oct. 24, 1916.

Application filed March 23, 1914. Serial No. 826,529.

To all whom it may concern:

Be it known that I, ALEXANDER GIRTAN-= NER, a citizen of the UnitedStates of America, residing at the city of St. Louis, State of Missouri,have invented a certain new and useful Chain Grate, of which thefollowing is such a full, clear, and eXact description as will enableany one skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, forming part ofthis specification.

My invention relates to a chain grate, and, particularly, to means forventilating the cross rods which hold the links of the chain together,thus preventing the overheating of such rods and their consequentbending, as is liable to occur in the present form of chain grate.

In the accompanying drawings, Figure 1 is a side view of a portion of achain grate made in accordance with my invention, the cross rods beingshown in section; Fig. 2 is .a section taken on the line 22 of Fig. 1;and Fig. 3 is an enlarged detail view of one of the spacing collars.

Like marks of reference refer to similar parts in the severalviews ofthe drawings.

5 represents the links of a chain grate, each of these links beingprovided with a web 6 in which are formed a pair of apertures 7 for thepassage of the cross rods 8 I I which hold the links of the chaintogether. In the form of chain shown in Figs. 1 and 2 of the drawings,each of these apertures 7 is surrounded by a shallow boss 9. In ordertospace the links a proper distance apart in this form of chain, eachpair of the links has placed between them a spacing collar lO'providedwith an aperture 11 substantially the same size as the apertures 7 inthe links. It will be noted that the apertures 7 and 11 are considerablylarger than the spacing rods 8 so that an air space is left between therod and the links and collars In order toallow the passage of air to andfrom the air spaces surrounding the rods 8, recesses are formed in thespacing collar. A portion of these recesses, marked 13, are beveledinwardly while another portion, marked 14, are beveled outwardly. Thisform of recesses not only allows the free passage of air to and from theventilating space but, at the same time, allows any foreign materialwhich might enter to readily escape.

It will be evident that by providing ventilating spaces around the crossrods and providing for the passage of air to and from said ventilatingspaces, the rods will be ef-' fectively cooled so as to prevent theiroverheating and bending.

Having fully described my invention, what I claim as new and desiretosecure by Letters-Patent of the United States is:

In a chain grate, the combination'with links provided with apertures toreceive cross rods, of spacing collars arranged between said links andalso provided with apertures, cross rods-of less diameters than theapertures in said links and collars, whereby air spaces are providedaround said rods, and recesses formed in the ends of said collars toprovide ventilating passages for the air spaces, a portion of saidrecesses being beveled inwardly, and a portion being beveled outwardly.

In testimony whereof, I have hereunto set-' my hand and affixed my sealin the presence of the two subscribing witnesses.

ALEXANDER GIRTANNER. 1. 1

Witnesses:

W. A. ALEXANDER, G. M. SHORE.

Copies of this patent may be obtained for five cents each. by addressingthe "Commissioner of Patents,

Washington, I). C.

